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Title: Machine learning analysis of high-repetition-rate two-dimensional Thomson scattering spectra from laser-produced plasmas

Journal Article · · Journal of Physics. D, Applied Physics
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [1]
  1. University of California, Los Angeles, CA (United States)
  2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  3. University of Rochester, NY (United States)

With the emergence of high-repetition-rate two-dimensional Thomson scattering (TS) measurements, improving spectral data analysis is a key area of interest. Here, we present a new way to derive the electron temperature and density of laser-driven blast waves in plasmas from their TS spectra with machine learning (ML). This analysis occurs in both the non-collective (α < 1) and collective (α > 1) scattering regimes with the goal of autonomously and more accurately determining Tc and ne both where spectral data has been collected and to give the ability to predict these attributes in regions where data has not been collected. We introduce three ML models, one trained only on experimental data, one only on synthetic data, and one using transfer learning, and compare their speed and accuracy with the conventional TS inversion algorithms in the open source PlasmaPy python package.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); University of Rochester, NY (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Grant/Contract Number:
AC52-07NA27344; NA0003856; NA0004033; NA0004144; NA0004147; SC0020431; SC0024549
OSTI ID:
3014011
Report Number(s):
LLNL--JRNL-864719; 2024-+125, 2159, 3001
Journal Information:
Journal of Physics. D, Applied Physics, Journal Name: Journal of Physics. D, Applied Physics Journal Issue: 3 Vol. 58; ISSN 0022-3727; ISSN 1361-6463
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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